import logging

from fastapi import HTTPException
from sqlalchemy.orm import Session

from components.dbo.models.log import Log as LogSQL
from schemas.log import LogCreateSchema, LogFilterSchema, LogSchema, PaginatedLogResponse


logger = logging.getLogger(__name__)


class LogService:
    """
    Сервис для работы с параметрами LLM.
    """

    def __init__(self, db: Session):
        logger.info("LogService initializing")
        self.db = db

    
    def create(self, log_schema: LogCreateSchema):
        logger.info("Creating a new log")
        with self.db() as session:
            new_log: LogSQL = LogSQL(**log_schema.model_dump())
            session.add(new_log)
            session.commit()
            session.refresh(new_log)
                
            return LogSchema(**new_log.to_dict())


    def get_list(self, filters: LogFilterSchema) -> PaginatedLogResponse:
        logger.info(f"Fetching logs with filters: {filters.model_dump(exclude_none=True)}")
        with self.db() as session:
            query = session.query(LogSQL)
            
            # Применение фильтра по user_name
            if filters.user_name:
                query = query.filter(LogSQL.user_name == filters.user_name)
            
            # Применение фильтра по диапазону date_created
            if filters.date_from:
                query = query.filter(LogSQL.date_created >= filters.date_from)
            if filters.date_to:
                query = query.filter(LogSQL.date_created <= filters.date_to)
            
            total = query.count()
            
            # Применение пагинации
            offset = (filters.page - 1) * filters.page_size
            logs = query.offset(offset).limit(filters.page_size).all()
            
            # Вычисление общего количества страниц
            total_pages = (total + filters.page_size - 1) // filters.page_size
            
            # Формирование ответа
            return PaginatedLogResponse(
                data=[LogSchema(**log.to_dict()) for log in logs],
                total=total,
                page=filters.page,
                page_size=filters.page_size,
                total_pages=total_pages
            )
    
    def get_by_id(self, id: int) -> LogSchema:
        with self.db() as session:
            log: LogSQL = session.query(LogSQL).filter(LogSQL.id == id).first()

            if not log:
                raise HTTPException(
                    status_code=400, detail=f"Item with id {id} not found"
                    )

            return LogSchema(**log.to_dict())

    
    def update(self, id: int, new_log: LogSchema): 
        logger.info("Updating log")
        with self.db() as session:
            log: LogSQL = session.query(LogSQL).filter(LogSQL.id == id).first()  

            if not log:
                raise HTTPException(
                    status_code=400, detail=f"Item with id {id} not found"
                    )
        
            update_data = new_log.model_dump(exclude_unset=True)
            
            for key, value in update_data.items():
                if hasattr(log, key):
                    setattr(log, key, value)
            
            
            session.commit()
            session.refresh(log)
            return log


    def delete(self, id: int): 
        logger.info("Deleting log: {id}")
        with self.db() as session:
            log_to_del: LogSQL = session.query(LogSQL).get(id)
            session.delete(log_to_del)
            session.commit()